Not sure but I'm still having issues with it even after deleting the prefs. Sometimes it seems fine, then when I start getting comfortable using it, something unexpected happens...last night it was drawing a closed curve within another closed curve. As soon as I'd draw the second CV of the inner closed curve, the entire thing would freeze. This happened several times in a row before finally working. A few days ago, the app made the mouse cursor flicker non-stop. Memory leaks as well. Very bizarre. I've never had these kinds of issues with any prior version of Maya so it is indeed a bit perplexing.